One difference between mixtures and pure substances is that

• mixtures can be physically separated.

• mixtures are made of one type of atom.

• pure substances have no chemical bonds.

• pure substances can be physically separated.

A __________ has distinct properties and composition that never vary.

• solution

• molecule

• pure substance

• heterogeneous mixture

Relate the temperature of a gas to the kinetic energy of its particles.

• As the temperature extends, the kinetic energy of the particles decreases.

• As the temperature increases, the kinetic energy of the particles increases.

• As the temperature decreases, the kinetic energy of the particles increases.

• As the temperature intensifies, the kinetic energy of the particles decreases.

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NGSS.MS-PS1-4

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When the sun heats up the surface of a puddle of water, the water

• condenses

• evaporates

• infiltrataes

• precipitates

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Maggie recorded her observations of the baking soda used in lab today. Which observation indicated a chemical property of the baking soda?

• odor

• color

• texture

• bubbles

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Grace is given a piece of wood, an iron nail, and a styrofoam cup. She puts these objects into a bucket of water and observes that the nail sinks to the bottom, the wood floats just under the surface, and the cup floats on top of the water. What property is being demonstrated by this experiment.

• density

• melting point

• solubility

• temperature

The images show two commonly observed changes.

• Picture I shows a chemical change, because a new substance is formed.

• Picture II shows a chemical change, because a new substance is formed.

• Picture I shows a chemical change, because the same substance changes form.

• Picture II shows a chemical change, because the same substance changes form.

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NGSS.MS-PS1-2

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Which of these is a physical property?

• boiling point

• flammability

• reactivity

• toxicity

Helium, neon, and argon are examples of

• metals

• metalloids

• noble gases

• transition metals

Which element listed is the MOST reactive?

• Fe (iron)

• Al (aluminum)

• Li (lithium)

• O (oxygen)